Aerator



Feb. 10, 1931. w. H. CURRY ET AL 1,792,236

AERATOR Filed Dec. 4, 1928 I17 3 g) I 7 9939993 9393.7.) m: 7 33: iii :2 3% 7 zwe.

Patented Feb, 10, '1931 on "1'50 HEWITT-GUTTA PERGHAhtnsimaoofironnrron, o B- FFALQ, YORK IAERATQB Application filed neeemimfl 4, 1928; Serial n6. 323,651.

Our invention 'relates to aerators used in oil flotation devices to separateilnineralparti cles from thegangue or rock with which minerals are usually associated, and has for its 5 object to provide a new andimproved aerator which, henusedin connectionwith the pres ent practice of separating ore, Willreduce the ent practice of separating oi'es. 10 i I aerator. which Willnot require the frequent repairs an'd new inst-allationswhich are fnecessary with the present mats usedfin' flota j etionof minerals, and which Will minimize the 15 precipitation-of linne on the met. 1 I

' A still :further bject is to fpi oiiidea'n air ter froth on the "top oithe waterith'an hash 'heretoforebeen aecompliehed.

Astill further object is to provide an aer atoi-which willibe, ueeeun c'ombinajtion'withthe usual mats used inrflotation cells and one which Will'leng'thenfthe life ofjthe matsfhe'f ingiisd and will increase the eflicienoy vof the bubbles on-theftop o'fithe water in the ore pulp v and bubbles start at the bottom of the cellian d pass up through the Waterand acids;- used" and through the finely ground 'orepu'lp to carry the mineral particles ;to the surface,

forming".- a mineralcarrying froth on the sur m I faeezofthe eell, Where it is skinimed-ofi' for car 1 ried over-into launders for fui' rtluar't-re'at'n 'rent.v

vmat. maintenance costs and-Will improve theepres tion'forming apart of this QPPliationand ,Inthepfrfloesq fieta ieiijeii'eiiiaeaaeed 1 through the icell in hiai'iy different means; all a s ha thexe "e aee n was aiesae tin 7 siasetiisethemie I-imewaiset messa es asreadily thereon and-the lnatfinay be used a-muoh longer period of:time.. 1

Also the use of theruhber mat superfine posed over the usual typeof matwill lengthen the life 'oflbo'th and Will be much more eflicient and therefore less expensive in the life of the These objects neac complish iirithlthed'evice V a illustrated in the accompanying drawinggin A furthrohjeet is t provide an improved which siinila'r numeralsand lettersyof reference indleaterl'ik'e ,Qpa'rts throughout the several Views and as deseribedfin thespecificapointed out'i nthe appended claims. 7

InQthe drawings, We hai e shownthe best and most preferred-manner oif 'biii-ldihg our.- inve itien. Figure '1 dis plan *viewef thefl th'r'ee inats used in a single icell rifith theone mat s'hoftvn' inflated, as. when the ear is 'beihg assed the'rethrongh. Figures; is a eeetien' .on1ii 1e2 2 ofFigure 1. Figure 3 is small portionof'of one ofthe inats ehlatged to show the -sh'ape of the perforations .theret'hrougly with the mbbereehown stftohed "to ope the perforations, with partslcii't awayjite show there-guis filtere at thereundea Fig re 4 is a vie'wshowing the opening ofthe Pei-fora tions enema the rows be; Ia e'd diagonally across the mat liigurfe 5 is a {diagrammatic v "at'i'n'use on'the notary type ma View ofthe chine v I V I In-the drawings we l Sl l OiiYil "the inatsias A; ar'idthe cells 'or, pans over which they are l secured'as B The said inats A aie niade of flatosheets of rubber and are secured to the Y pans B by the inetal s't'rips .li ia-ndfthe bolts Otheii means be u'sd tO'SCUr the met s theqaanee r tofs'iused. Thesaid pans B areproiiide'd with air inlet opening-e QfHZl-ifO Li-g centeshaped perforations 5 are molded oi" thr'eiigl Jth and? thebsttdei g;

hich air under ressure 'is forc d t e are ofthe fa r, 'li'WlIl V stretch upwardly and open the cuts, allowing the air to pass therethrough. The said per forations are made with a very sharp tool and are so made that'when the mat is deflated they are semi-circular cuts and there is no opening through the rubber whatsoever, but when the air is introduced through the pans the valves will open in moon-shaped perforations 5,"allowing the air to pass th-erethrough.

The perforations and the shapethereof are the -prime .factors of this invention and are so constructedpas will be seen from the drawings, that when the mat stretches the inner lip portion G of'the crescent cut 5 will be forced upwardly and the outer periphery 7 of the cut will be drawn away from the portion 6, making'a'small crescent-shaped open- 2 ing therein, and whentherubber is allowed to resume its primary position the lip poravalve, and the periphery '(is drawn back place, the mat A is superimposed over the" tion .6 resumes its initial position, acting as to contact with the portion 6, forming a slit through the. rubber which will completely close the hole therethrough, andthe placing ofthe mat over the top of the usual mat adds life to both mats and protects the rubber mat from excessive stretching and the perma-v nent stretchresultiiig therefrom. H

Itwill be seen that varying air pressures and volume'will affect the arch of the rubber mat and that the valve aotioh'of the lip' 'portion 6 will open according to the pressure and volume used. The perforations are'made close together and "in such number that the air, in inflating or arching the matywill not stretch the rubber mat A toogreatly and, to insure that this stretching will not take top of the porous fiber or canvas mat C, which mat is made "as in'the present day use, but when the rubbermat is. placed thereover and the air is passed through the mat G and through the perforations '5the mat C is used to reduce the'velocity of the air andto finely separate the air stream whil'efthe perf0raj tions 5 distribute the bubbles throughout the cell. .Alsothe mat C isto prevent the rubber mat A from stretching to such a degree that it will be permanently stretched and will not return to its initial position. Theuse of'the" mat C will more evenly distribute the air through the mat A, and the ajction of the; valve portions 6 will preventthe'gangue or" the liquid from getting throughtheperforations 5 and rotting the mat (l orprecip'itating;

thereon or from getting into the panel? below themats,

Thisconstruction of themats, onejs uperimposed over the other, providesanaerator which, when'the air is introduced thereunder,

will arch without, stretching' and 'the'rn'at- G: and the matA do .not separate, butthe'air'under the matCwill'. arch bothmats 's'imultane ously andwill.open-the'jvalves 6.0'f theperfo rations 5 in the mat' Ai by. the" arehiriglbrbending rather than by stretching the rubber mat. When the mats are so arched the bending of the rubber mat A will partially open the perforations 5, and when the air pressure is sufiicient the valves 6 will open distributing the air through the perforations 5.

It may be possible that a porous mat of sponge rubber or other such material'could be formed on the bottom side of the mat A or integral therewith andaccomplish the re sults required.

Ap licants have also "discovered that this construction of mats may also be applied to filtering processes.

In using the mat on the rotary type of aerators the mat will be placed around the rotor and will be made in a tubular "shape and-will be held'thereon'by circular stripsjor hoops of metalor rubber bands slid over the ends of the rotor. Figure5 of the drawings shows the use with the rotor, and it, will hejobvious' that the mat be usedwith all types of machines, using he porous medium for the" distribution of air therefrom. j Having thus described our invention we de 7 sire to secure by Letters Pat'ent arid claim 2" 11. In a device of. the class described the" v combination of'an air'cha mber; asheetof filtering material secured to the edges. over the entire surface thereof and a sheet of'rubher secured and'gsuperimposed thereover, with crescentshaped cuts through saidrubber to allow for passage of air therethrough'.

2."In a mat for use in distribution of air a through liquids.thelco'mbination of a pan and a mat of canvas secured thereover and to the edges" thereof and a sheet of thin rub bersuperimpOsed over said canvas having rows of semi-circular perforations through said'rubberada'pted to open when air is intro-- duced into saidpan'and through said mat, andtoallow said air to: pass through said perforationsat varying pressures and volume. V 1

3. In amat for use'in distribution of airf through liquids, the 1 combination of aisheet sheetgof; rubber carried on said porousjmat 1 10 oflporousmat secured over a pan; and .a "thinwith perforationsthrough said rubber 'hav- I ing1a1 lip portion: adapted to the 'iaised from and lowered to the main body of the rubber duced into pan. =1,

5; In a :mat'for use in-distribution ,oflaiir it ou h li dsthe. i om inat on air chamber; a porous mat secured there.over;;i

a sheet of thin rubber superimposed over said mat and secured to the edges of the air chamber with the porous mat and the sheet of rubber adapted to arch over the air chamber when air is introduced thereinto; and semi-circular perforations through said rubber sheet adapted to have the inner valve p01 tion thereof raised by the arching and the air pressure thereunder to allow passage of air therethrough.

6. vIn a mat for use in the distribution of air through liquids, the combination of an air chamber havinga porous mat secured thereover and a-sheet of rubber carried over said mat, having semi-circular perforations through said rubber adapted to break the seal thereof but not open When the mat and sheet are arched over said air chamber and to open when the air pressure is applied sufliciently thereunder.

In testimony Whereof we have aflixed our signatures. I WVALTER H. CURRY.

HENRY F. DIETZ. 

